It's pretty valuable. You could get $100-250 for it.
It's the ONLY US Soundwave reissue that uses the original window for the chest (all US reissues use the Sountblaster mold with a larger chest window to fit the second tape).
It also has FOUR tapes, whereas nearly all reissues of Soundwave for the US market only have Laserbeak.
It's pretty much the best reissue of Soundwave to come to the US, so it goes for a pretty penny