Victor,
Sorry it took so long to respond, believe me it wasn't intentional.
As to your question.
The most of revolvers produced in Monson came out under the watchfull eye of Daniel B. Wesson himself. He prided himself as to their quality. It was during this time the actions and triggers came out well tuned as opposed to "liability limited heavy".Sure some mistakes got out but not many. Dan Wesson revolvers consistantly took all the top places at the IHMSA matches. This is a testiment to their accuracy and durability. Those competitors not only shot lots of loads but they were hot to boot. Towards the end Dan sold the company and it was later moved to Palmer, Mass a little ways up Rt. 32.
The guns that came out of Palmer were of good quality but a lot more clinkers hit the market and the Dan Wesson name lost some of its esteem.
After the Palmer operation went belly up the group currently producing Dan Wessons in New York bought the name and tooling and for the past few years has been cranking out DW revolvers. The jury is still out as to their quality. Most of what I have seen from the new owners is top notch, but I have seen enough lack of attention to detail on a few pieces to make me hold full blown across the board recommendations.
As to the Model 15 badly out of time. It is most certainly repairable. It may not be out of time however. If someone took the sideplate off and was not carefull during the re-assembly, the hand will not mate properly with the ratchet on the cylinder giving the impression of a badly out of time revolver. As to price, $269 price, that seems about $25 high, particularly if the revolver is out of time. If your not comfortable with it I'd pass and look for another.
Hope this helps. If you'd like more info or I can be of any further assistance drop a line.
Take Care