Wow.. Real vintage !! , i remember i use to own 1 many many years ago from casio that can genarate dial tones fr the tiny speakers on the watch. We use it to make free calls on those orange public phone b4 they change it to the silver type & same can also be done for some people that use lock on the fixed line dial pad to make outbound calls
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bro i saw a nos casio dba-80 at jaya shopping centre last week ... (i dont think it comes with b&p)
thats right ... my friends said in the 80's it was very famous but no chance to try one ...