The first musket is a converted to percussion, cut down India Pattern Browm Bess. These guns made by Ramsay Sulterland were issued to the New Brunswick Militia the time that the Napoleon Wars were going on and New Brunswick was fearing an invasion of the Americians wanted to arm their Militia. The Tower was at that time not able to supply NB with the Brown Bess so a contact was awarded to Ramsay Sulterland, a gun make in London during this period. There was actually 2 Sulterland brothers, Richard and Ramsay gun makers. You will find a few Indian trade guns by Richard and Ramsay Sulterland . Ramsay aquired the locks from the Tower and removed the Cypher and the Tower stamping. If you feel the side plate it will have a slight dished feeling where the Ramsay stamp is. He stocked and barreled these guns and shipped them to NB. The Westmorland M. brand on the stock is for the Westmorland Militia. There is a Wesmorland County in New Brunswick. A lot of the Brown Bess's from the Martimes are stamped in this fashion. The barrel original length was 39" and .75 caliber. Another feature that is only found on the Ramsay Sulterland Guns is a Fleur de-lis stamp on the barrel near the touch hole. I would estimate the value of the gun in that condition to be around $800 to $1200. If it were to be restored back to original flint, with barrel and wood streched to correct length the valve could be around $2500 depending on the restoration.
The second gun looks like a pattern 1853 musket but the rear sight is not correct (it's a pattern 1842 sight) I would have to see both sides of the gun plus the barrel length. The barrel length should be 39". caliber .577.
Value if original and correct $800 to $1200.
If these guns are in NFLD then it is possible that they were used as sealers, but the condition dosen't look like it, not a lot of salt water damage.
I hope this information helps.
Road King