http://www.egg-coddlers.com/Wade/
I believe yours is next to last on this list !! From Bermuda !! None I have seen have a chain but it seems that would be logical !!
Values run between $12. and $20. depending on age and if its a single or double !! Yours is on the newer end and would be around $12. to maybe $15. if no chips ect !!
Thank you! Nice to know.