Anyway, that's an adam 803. 30 years ago, in my area (France), the 801, 803, and the high-end 901 ,902&903 Adam cues where famous , if not the best avaible in my area ! the adam shafts where excellent in the late 80's/early 90s.
most of those cues were bought to play small games, so i would expect the weight to be beetween 470g to 490g.
it should be a very good cue to play small games , and worth to be played ! i dunno in the USA, but in europe you can still find new shafts for this model (wood pin) .
About the price, in this shape , if the shaft is straight and not too skinny (>10.5mm) , i would buy it for 120 to 150€ at max. or 120$ to 150$ at max.
Well, that would be indeed the price of a new/replacement shaft , but , to me, that's an awesome "old school" straight rail cue...
in France it's rare to find old 803's for sale, or they sell verrrry quickly , at a cheap price usually. Because many players tend to keep them preciously as "souvenir" of their young years

. I still own my old 803 and it won't be for sale.