This bridge was fitted to the original 1970s Swede Bass and the Swede Patch Bass produced in Sweden between 1971 and 1977, and does not apply to modern day iterations of this instrument.
This bridge is wider-spaced than the Swede bass tailpiece, at 74.0mm (post centre to centre) compared to 64.1mm for the tailpiece. Chrome plated. Unlike the tailpiece, the bridge is height adjustable with the two mounting posts. The saddles are held in place on a central rail, with a screw either side of the saddle. These screws have the dual functions of holding the saddle in place (you can slide each saddle left or right for perfect string spacing); and setting the intonation - though this is more or less impossible to do whilst in situ and only offers limited horizontal movement. This design is certainly a great improvement on previous Hagstrom bass bridges, though still not the easiest to adjust, lacking some of the range of some better (typically newer) bridge designs. In effect, the saddles have an adjustable range of about 5mm, which is ok, but, depending on string gauge and neck adjustment might not always be adequate for perfect intonation.
An ideal setup would have each string positioned perfectly over each pickup polepiece - in practice this is impossible, so careful saddle positioning along the bridge rail is critical to maintain comparable outputs from each string / pickup. The saddle design is such that any intonation adjustment also risks upsetting this positioning. Its a finicky design, and care must be taken when making any adjustments.
Combined with the tailpiece, this bridge replaced the various combined bridge/tailpiece variations fitted to Hagstrom basses throughout the 1960s.
List of Hagstrom guitar and bass parts

Hagstrom Swede Bass bridge, in situ, top view. Note that the bridge is angled with the bass saddles closer to the tailpiece.

Hagstrom Swede Bass bridge, in situ, front view.

Hagstrom Swede Bass bridge, in situ, front view. The bridge rail sits on two posts, which allow height adjustment of the whole rail, but not each saddle individually.

Hagstrom Swede Bass bridge, side view. This image shows how the screws adjust intonation on each saddle. Looking at the E-string, the saddle is as far towards the bridge as it can go. It can be moved towards the neck by loosening the left hand saddle screw, and tightening the right hand saddle screw. Note also, the 'crest' of the saddle is off-centre. If the screws are maxed-out, the saddle itself can be rotated (as is the case with the G-string) to increase the saddles range. In effect, a little more range would have been preferable.
Note the apparently nickel-plated post-hole sockets.

Hagstrom Swede Bass bridge rail and saddles, unmounted. The adjustment screws are 6mm long, M2 thread, with slotted pan head.

Hagstrom Swede Bass bridge: rail with no saddles, top view.

Hagstrom Swede Bass bridge: rail with no saddles, underside view. This rail simply sits upon the two posts, and is held in place with string pressure. This arrangement is fine when the bass is strung, but obviously allows the possibility of the rail to be lost if the bass is unstrung for any length of time.

Hagstrom Swede Bass bridge saddles, unmounted, top view. As noted above, the 'crest' of each saddle is off-centred to increase the horizontal adjustability (depending on orientation) and improve intonation.

Hagstrom Swede Bass bridge saddles, unmounted, underside view.

Hagstrom Swede Bass bridge rail with mounting posts

Hagstrom Swede Bass bridge mounting posts