Looking for a vintage T-shirt that's a blast from the past? Check out this double-sided General Instrument Math Calculator T-shirt from the 70s. With its blue color and regular fit, it's perfect for men who want to relive the good old days. The shirt is pre-owned but in great condition, with no signs of wear and tear.

The shirt features short sleeves, Hanes branding, and a classic 70s theme. It's a regular size and made in the USA, so you can trust the quality. The shirt is perfect for collectors who want to add a vintage T-shirt to their collection. Don't miss out on this unique piece of clothing!