This is a Kraft Series 71 6 channel Am transmitter on 72.080 Mhz. It is a dual channel design, with the slide switch to select the different internal crystalo, howeve, I have not closely examined the circuitry. The top switch is for two position retracts and the central lever is a 5th channel.

 the back screws are taped to the inside, and the battery pack needs to be removed. it uses two packs of 1/2 sub-c 4.8v. (In my Tx I actually use a 3 cell LiPro), so LiOn cells will be useful. Schematics and manuals are possibly available from on line at "vintagercfiles,com".

I can combine items and I also ship to Canada