I don't bother to weigh my eggs, but it was a tiny little thing, buff/tan/pink colored. My Pioneer pullet's eggs are almost as big as the RIR and BSL hen eggs now.
I just use my cheap little spring weight kitchen scale to weigh my eggs because I'm always curious to monitor the size/weight of my breed eggs. Someday I'll find an egg scale I like but for now the kitchen cheapy does fine. Leghorns lay up to XL eggs however my Leg's first egg barely weighed more than my largest Silkie egg. She eventually got up to 2 oz eggs but never reached XL like my first Leghorn.
I hope when I get Doms they will lay the pink eggs. Pink eggs never seem to be very big - at least mine never have been. I had two Buff Leg sisters that layed one pink and the other tan. I noticed that the darker eggs were bigger - coincidence that pink are smaller?