I've used that one and they are on e-Bay. Had good luck with them.I've been looking at this one, supposedly it's a reproduction of the Signal Stat 900
https://www.ebay.com/itm/301648289738?itmmeta=01J5X6CWFJN4213J95M54N36WH&hash=item463ba39fca:g:RpgAAOSwIVhaSBzv