Vintage USA 1970s Souvenir Tee- Shirt
Vintage tee- shirt,  featuring ‘Caution: Person in this shirt may blow top at any time’ motif to chest. 
This tee- shirt features mild bobbling and some marks to back.
Measurements
 
I estimate that this top would best fit a Men’s XS or Women’s XS S, in fitted style but please read measurements below:
Labelled to fit a vintage Size M.
Pit to pit 17”
Shoulder to Shoulder 16”
Length 25”