I haven't seen a 0.050 inch pitch DIP. ?Perhaps
you're referring to the
0.070 inch pitch "Shrink-DIP", which was very common for a while from
Japanese vendors.
I remember seeing them. At one point I had a calculator that had the
Shrink DIP (0.070 inch) and and even finer pitch DIP (assume it was
0.050 inch). Oddly, they were both surface mounted gull wing style.
--
Will