[shellback3]

I was issued one at King's Point Merchant Marine Academy in 1957 and used it constantly. A side benefit was the learned ability to estimate an answer and decimal point a skill which I still use. As I recall I mostly used multiplication, division, logs, and trig. I think I quit using it when I purchased a HP scientific calculator years later.

[kstrauser]

Re: your username

My mom found my shellback card among some stuff in her basement and asked if I’d like her to send it to me. Yes, please! Darned if I want to earn a replacement card.

[shellback3]

Shwllback3 was my radio callsign in Vietnam in '67 & '68.

[kstrauser]

Nice. I got mine 4 miles off the coast of Mogadishu in '94.

[HardwareLust]

I got mine on the way home from Australia in 1985.

[kstrauser]

Did you fly out and then sail home?

[HardwareLust]

Nah, it was the tail end of a WESTPAC, we were on our way home from liberty in Perth. We skipped it on the way down.