Still trying to I'd this but don't throw it away! (Send it to me!)
Update: This is hard! Most of the doll bouquets I've looked at have fabric flowers or multi colored flowers! From what I did see most plastic flower bouquets were from the 70s-80s. Couldn't find an exact match but I'v found something similar.
I found these on UK ebay; they look like the flowers and also have the finger hole (it's a big bouquet made from two).
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loginThe description said this was similar to Sindy's 1974 Bride outfit bouquet seen here (picture credit to the site OurSindyMuseum:
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loginThis bouquet does not have the finger hole on the stem and it has tulle and cotton lace but again, the flowers are similar.