Antiques: Tin sign with value to dye for

Q I buy household estates with a friend and we found this sign titled ‘A Busy Day In Dollville’ lodged between a couple desks in a back room. After some searching online, my friend was shocked to find it might be worth more than $1,000. I’ve had many people offer me $200 for it. The tin front measures 30 cm high by 43 cm wide (11.5 x 17 inches) The cardboard-covered back states the company address of ‘200 Mountain St., Montreal, Que’ and promises “duplicates c