Which way to proceed?

[grantybe]

Auction it. It will find its current price. Just make sure the auction house use the sale room or easy live auction platforms.

[Mark D]

Take some decent photos - outside with good light and post them on here, asking for a valuation.
Once you have a figure (you will get some idea from the figures posted) then you can do a 'sales' thread with price required.

An Auction might be a good idea, if it was a rare or highly desirable item, but I suspect a 1907 BSA Long Tom wouldn't fit that description.

[rapidresponse1]

as above post good pics

[averageplinker]

If you commit it to auction make sure you check what the fees/costs are first.