Of course, side-lever Woodwards aren't exactly chicken scratch either. Best I can guestimate there were about 10 of them made ----- and mine isn't going to be for sale any time soon! Just to be cute, I put a set of .410 tubes in it and it does nicely for a skeet gun.
Nothing to choose in Brand Value (BV1) among Boss, H&H, Purdey, and Woodward. Grant (along with 16 others) is BV2 (3/4 value of BV1). Do keep in mind that Original Quality (OQ) grade and Current Condition grade are independent of brand name (and BV).