hifi engine

Info on some old speakers I came across

I found a pair of speakers with no known name. There is a label on the back about the size of a stamp with the word penny on it. Also part of another label with adler manu corp. I took the back off and they are 2 way. The bass speaker magnet looks more like a transformer not a round magnet. I hooked both of them up and they sound good with a 30 watt reciever. Any info would be great. Oh ya. Wood box with real wood venier.