Hi, petenice,
Perhaps you have more experience than I do, but I have found that checking the inside of a barrel is not always a good way to determine if the gun has twist or Damascus barrels. I think I would remove the paint for a better check.
However, I found one reference to Horace & Soley that says they were in business in London from 1917-1930, well past the Damascus era. It is not indicated whether they were gun makers or a retail shop; if the latter, they may have sold older guns.
Jim
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