Now here’s a little treasure in my collection. The LTX-2 Thin Coax Transceiver IEEE 802.3 10Base2, manufactured by Lantronix, made in USA.
Acutally I have no idea what this nice little gem was used for, but I believe you could use it to connect your computer via the 15-Pin D-Sub (left side) to a RG58 Coax-wired network (right).
I really like the positive approach on labelling the LEDs on it “Heartbeat” and “Power” – this could as well make up a very nice T-shirt design.

2 Comments
it is for Ethernet/IP. Allen-Bradley old PLC5 used it to convert BNC to AUI transceiver.
Similar has SMC3402BNC, TRENDnet TE-T2, Allied Telesyn CentreCOM AT-MX10S, etc.
I think I could have an Idea what this gem was used for:
In the early days of Ethernet, the cables were too thick and inelastic to go directly into the computer. So you plugged your computer to a transceiver wich was then connected to the rest of the world via ethernet..
You can still buy those transceivers: dealtime.com/Lantronix-LTX-2-LTX-2/