A noise bridge first launched in 1972 - and its still working fine. Originally $39.99 and rated up to 300MHz. A google of 'TE7-02' will find you a page with some info.
It generates lots of noise on HF and VHF, it tails off a bit above 300MHz but there is still some present on 432MHz.
With an alkaline 9V battery fitted. Minor marks and tiny scuffs on the green plastic case. Clean and un-messed with internally with the original polystyrene battery packing 'cell' intact.
300grams packed up safely. Offers above starting price considered, auto-accept set to £30 if you really want it and nobody else has bid.