Here is a Scarce, Dennison Howard, & Davis 18s gilt, with 15 confirmed jewels Pocket Watch Movement only.  The serial number is 4883, which puts it towards the end of production of The Boston Watch Company before it failed in 1857.  These watches were made in several variations, which included jewel count, whether or not it had a keyguard, and 2 types of dials.  Records for the Boston Watch company are lost, and estimates for total surviving examples are best guesses in my opinion.This particular example is complete minus the casing screw.  It is VERY gummed up and will tick only briefly.  I can confirm 15 jewels and that the numbers on the hour wheel, minute wheel, and balance cock all match the number on the barrel bridge.  The barrel is fully wound and the cover is popped up.  The key guard is NOT original - it should be a blue one.  Some of the screws are mismatched.The dial is correct.  The hands are ALL replacements.  The dial is in very good shape with no fractures or chips and one hairline by the 11 o'clock.Again, you should be with the understanding that this watch needs a service and some adjustments, at the minimum.  But its a good example of Early American Watchmaking - and before the Civil War too!Because of its value, I will be sending this watch REGISTERED, USPS mail. So it will take a bit longer to get to you.Being sold AS IS, Where Is, As Found! Please ask questions before bidding and thanks for looking~