Wow! About the completest collection I've ever seen.
"patina imparts character" - PJS
A wise man said: 'you should not pay a premium for what you want beyond your comfort level, and always ensure there is a mutually agreeable return policy.'
Here is a 2nd Class numbered #19 that was made by the Enamel Factory of the Moscow Fellowship Of Artists. The Badge will date from around 1950-53. The white enamel has nearly all fallen off to be replaced by a splash of paint.