I have a strad trumpet serial number 34*** which a friend has asked me to sell for them. It is a model 72 and has MLV on the 2nd valve casing. I looked up the serial number and it appears it is a very early Elkhart horn. I'll be listing it on Ebay and wanted to get the description correct so could someone tell me what the MLV means?! I don't know a lot about Bach models etc so any information would be appreciated. There are no numbers on the leadpipe receiver regarding size etc either. Thanks in advance!