The Musketoon is VERY short - like 40.25" overall.
If it is made by Parker-Hale it will have the following marks/stamps on it -
Lockplate - Left to right, behind cock Crown over P H, then 1861 over ENFIELD.
Underneath - if you take the barrel out of the wood - NOT recommended unless you have already done it
- underneath the barrel - BLACKPOWDER PROOF ONLY [or similar words] 3.5 DRAMS BP and sundry proof marks.
Buttstock RHS - the circular Parker-Hale stamp in the wood.
Left-hand side of breech - serial number - SHOULD be only FOUR digits to be a P-H.
IF it is a genuine P-H in 1st class condition then it will be around £325 or so.
A Euroarms version will be around £250-ish, as it does not usually have the progressive-depth rifling of the original - plus, it ain't a P-H.
tac