Hi! I have child's tea set that has been handed down thru at least 5 generations and has a handwritten label on a standard cardboard box "Scotch Child's Toy - over 300 years old" written in 1950's. It is NOT in good condition, but we're trying to find out if it is truly that old (to amaze our grandchildren ). I tried to Google the Myrtle Mark, but could nothing. Thanks for any help you can give in dating this item