[GreenKeys] off topic "Telegraph"

[Nick]

I found this on eBay :

https://www.ebay.com/itm/ANTIQUE-BENEVOLO-DIAL-ALPHABET-TELEGRAPH-RECEIVER-SENDER-RARE/222262561130?_trkparms=aid%3D222007%26algo%3DSIM.MBE%26ao%3D1%26asc%3D20140131123730%26meid%3Dafc41302ccd3496d8c2e13223916fa4e%26pid%3D100167%26rk%3D4%26rkt%3D6%26sd%3D162723715101%26itm%3D222262561130%26pg%3D5411&_trksid=p5411.c100167.m2940

Does anybody exactly knows what it is, how it works, is it complete?
If you have any info or even links, please let me know.

Thanks !!!

Nick  -  N0NCQ
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