Green-painted Shaker Berry Bucket

My parents got this when i was a kid. I've always liked it and they gave it to me when i was home vacationing last week. it's from the Enfield Shaker Community. I like how the inside is a different color green than the outside. apparently, the diamond-shaped piece is a sign of Shaker craftsmaship. it's so well made that i've used it to hold water. I was looking at it tonight and i think i found some initials in the bottom of it. Something like an S X. i wonder if this was the name of the maker or the owner. It's so beautifully made. I found some similar ones which had sold at auctions for a surprising amount. Any experts in Shaker furniture out there? I'm wondering if it is a known signature.