I may be wrong but I think you have an older Magnum that was made back in the days when Thunder Tiger made them. If so I would regard it as higher overall quality than is now produced. Look on the case and see if it has any markings like M.I.T. or something other than numbers. These are normally good engines and a lot of parts are still available. I believe Magnum and TT parted company with Mag going to china and TT coming out with their own engines. It is a 44 and they also made a 53 that I see for sale once in a while.
FEB