Anonymous ID: 31244b Jan. 29, 2021, 2:49 a.m. No.12753618   ๐Ÿ—„๏ธ.is ๐Ÿ”—kun   >>3629 >>3633

>>12753579

Looks like a Mark 5 Satano Radon Transponder. They used them in the First World War when they captured messenger pigeons. They'd insert one and then release the pigeons to go to finish their journey.

I know this because they were steam powered, just like that one.