Salaams All ~This one looks very much like an Omani Abu Futtila...(The one with the match) It is interesting how the National Museum people view this and I note the people who did all the Gun and Cannon research consider European involvement probably German in the manufacture...
See
http://www.vikingsword.com/vb/showth...ght=Omani+Guns
For a report which is Cannon Fort and Gun orientated etc see
http://www.klm-mra.be/icomam/downloads/issue07.pdf
Regards,
Ibrahiim al Balooshi