OK. I'll give you the best answer I can, but I think you misunderstood the point of my earlier comment, to wit,
I paid $40 for a used Adam in the 90's that looks very much like this but mine has a Helmstetter signature. I still have it."
I intended that you understand that even after this much time, I think it's unlikely they're highly valued. But I'm not a collector; I'm a player, and for me it has great utility. I'm impressed it has lasted this long. However, I also like to write sometimes and my preferred pen has great utility but it's not worth a lot.
These Adam cues are machine spliced and mass produced. Think cookie cutter and you get the right idea. Further, the wood on wood joint is not all that desirable among players in general. I just happen to like them. So, given all the foregoing regarding condition, i.e. the ability to remove the gunk from the joint, if that's the original ferrule, and if it's straight I would make an offer, but we both know it would be well below your expectation and I don't want to embarrass either of us by naming a figure if you can get something close to what you expect based upon some knowledge or connection I don't have, with all due respect. I just don't think rare always equals valuable automatically.
Now, all that having been said, in my honest opinion, if you find just the right person, you can maybe get $200 - $300 (CAD) more than I would pay for it. Something psychological in me rebels against buying something without a price tag, but I wouldn't go over $100 and I doubt I'd agree to pay even that much, frankly. The prices of handmade cues coming out of the UK right now make it impossible for me to justify such a thing. In fairness, when I really give it serious thought, I couldn't be a serious bidder without examining it in person anyway; I beg your pardon for suggesting otherwise.
So, I'm going to tell you it might be worth about $200 - $400 to the right person on the right day, but I'm definitely not the right person and you might have to wait quite a long while for one to come along. For my part, I had someone show me a used pool cue the other day, said they paid $1200 and offered it to me for $800. I near hurt myself suppressing the guffaw. 75% of the price is the fancy crap on the butt, as far as I can tell with pool cues nowadays.
Best of luck. Ash is beautiful. I hope you get as much out of it as I have out of mine.