Based in Segeltorp, to the south-west of Stockholm, Mattson & Zetterlund was a small machine tool company little known outside their native Sweden.  In 1987 the firm was sold to Nife-Jungner of Oskarshamn (specialists in tool-grinding machines) who kept up production for around ten years before selling out in turn to Industrimaskiner AB in Stockholm. Sales eventually ceased in 2007 - though with some service and parts still available (year 2010) from Lars G Johnsson.
In typical northern European tradition, the "M & Z" Type VF-600 milling machine was a very high-quality product (all geometrical tolerances where held to better than 5 microns) with considerable attention to detail, heavily built (it weighed 1100 lbs/515 kg) and enjoying a comprehensive specification. In design (the table sat on the base and did not elevate) it resembled a jig borer of the Linley, Vernon and SIP 1-H type, but with the great advantage that it was usefully larger and fitted with a head that could be tilted 45° to each side of vertical. To aid stiffness, the foot and column were formed in one piece, with the casting up to 30 mm thick in places where extra strength was needed.  With three T-slots, the 227/8" x 87/8" ( 580 mm x 225 mm) table had 13" (330 mm) of longitudinal travel and 8 1/2" (215 mm) across; an enormously deep structure, it was carried upon an equally robust saddle. Both the front face of the table and the left-hand face of the saddle had a T-slot in which to mount adjustable stops together with - handily provided as part of the standard equipment - trays with built-in rulers to carry dial indicators and length rods for toolroom work. Where the table feed screws ran through the end-of-table support plates, ball bearings were employed to reduce friction and improve feel - whilst the bronze feed nuts could be adjusted to eliminate backlash. Available as option, and driven by its own electric motor, was a six-speed table-feed gearbox. Looking rather vulnerable - it was flange mounted at the right-hand end of the table - the box provided feed rates from 1/2" to 9 1/2" (15 to 252 mm) per minute. Happily, handwheels were fitted at both ends of the table, as anyone paying Swedish prices in the 1950s might have expected. The knee vertical feed was by a 2-mm pitch leadscrew running through double bronze nuts to virtually eliminate backlash - the makers stipulating a maximum of 0.02 mm when new.
Mounted on V-edged slideways, the entire head assembly, with its flange-mounted 3/4 h.p. motor, could be elevated through 125/8" (320 mm) with the spindle nose (extended to the end of the quill travel) able to be brought down to contact the table - or moved to open up a gap of 153/4" (400 mm). The throat - the clearance between the inner face of the column and the spindle centre line - was 9" (230 mm). Of hardened (nitrided) steel, the spindle had ground splines, ran in an adjustable, 2-row cylindrical roller bearing at the bottom and a radial/thrust bearing at the top - the low-speed gearing being supported in its owns single and double-row ball races. Operated by either a quick-action rack-and-pinion feed for drilling, or though worm-and-wheel gearing for a fine feed, or , the quill had a travel of 31/2" (90 mm). Machined flat, the left hand face of the head was equipped with two T-slots, each fitted with it's own micrometer adjustable stop so allowing the operator to set two depth of quill feed for each job. For export markets the choice of spindle nose must have restricted model's popularity: originally equipped with a W25 type, the makers then settledon the  Swedish and American standard 1 1/4" - a taper that resembled the better known 30 INT.
Only single-speed motors were listed - 960, 1400 or 2800 r.p.m. - that, in conjunction with a lathe-like backgear assembly and a 4-step V-belt drive, gave speeds that ranged from a slowest of 70 r.p.m. (backgear with a 960 r.p.m. motor) to a highest of 4560 r.p.m. (open drive with 2800 r.p.m. motor). However, the most sensible choice for general work would have been the 1450 r.p.m. unit - when the eight speeds available ran from 100 through 145, 250, 390, 525, 770, 1325 and 2065 r.p.m.
With the spindle set to run in low range, it was possible to engage a 2-speed power down-feed to the quill, a great asset when using a boring head, or for heavy-duty drilling.
Supplied complete on a heavy stand with knee cut-out, the VF-600 had factory-fitted, built-in electrical switch gear, the switches for spindle, table and coolant motors being mounted  on a facia panel. 
It is believed that around 1300 to 1400 examples were produced in total and, if you have one, the writer would be pleased to hear from you.