Whose autograph is this on a Sailor Moon pencilboard?

Question

Whose autograph is this on this Sailor Moon merchandise (it looks like a shitajiki [pencilboard]) from the SuperS season? Is it a seiyuu, or a production company staff member such as an anime director, a SeraMyu musical actress, or is it supposed to be one of the characters' own signatures from an kigurumi live-action stage show? It looks to me like "Amさぎ" or "Smさき♡" but these combinations don't ring any bells...

(Here is a sample from a kigurumi show where the actress signed as Sailor Moon instead of her real/stage name in the same way that Disney costume characters at Disneyland sign as if they were the character)

Answer 1

nhahtdh's comment is correct.

I guess it's Usagi, where the A part is actually 月.

A photo of a merchandise from Sailor Moon S shows that the first character looks like 月【つき】 (moon).

^{Image taken from のり's yaplog, a Japanese blog}

However, the signature seems to be a corrupted version of 月【つき】のうさぎ (Moon rabbit), as clearly shown in another photo of SuperS' merchandise.

^{Image taken from ゆかりん's Twitter}