The single pickup Guild SB-201 was a long scale solid body bass guitar model, only available briefly between late 1981 and 1983. The bass was first included (and pictured) in the September 1981 price list at $525 - rather similar in price to the soon-to-be-deleted B-301 at $515; effectively, the SB-201 replaced the B-301. Initially it was described (and pictured) as having the same DP-8 pickups as the B-301/B-302, but the (presumably) prototype SB-201 pictured in the September 1981 price list shows a bass with a somewhat different body shape with a noticeably shorter top horn. By the time of the 1982 Guild catalog, the SB-201 is equipped with a newer Guild split pickup placed fairly centrally. The example below in Metallic Blue finish is not totally representative of the production Guild SB201 - the final pickup location was somewhar closer to the bridge than in the bass shown here.
However, the vast majority of production basses eventually shipped with the older DP-8 pickup. Although the body shape is quite different, the headstock design, machine heads and heavy duty BT-4 bridge all hark back to the B-301/B-302. The body is quite conventionally styled, with the rounded pickguard perhaps giving a nod to the Musicman Stingray.
The following text is taken from the 1982 Guild catalog
Our SB-201, SB-202 and SB-203 models cut through to let players showcase their talents to the fullest. All these models offer exceptional balance and feel, plus quality hardware like our adjustable BT-4 bridge and Guild deluxe machineheads with a 22:1 gear ratio
This image shows the Guild SB-201 bass, (alongside the S-25 and S-250 guitars), from the September 1981 Guild price list. This prototype version of the SB-201 has a quite different body shape - more akin to the preceding B-301, with a short top horn. Note also the difference in pickup and control placing. Although hard to see this bass also has no scratchplate.
The Guild B-201 is a somewhat rare bass; they were not a massive success commercially. 1980s Guild basses in general tend not to attract anything like as much attention as their earlier models, yet retain much of the quality and workmanship. This offers the opportunity for a great quality bass at a very affordable price. 1980s Guild basses are certainly worth checking out if you can find one!