Looks like real leather. Nice find. I have no idea about the weapons although they appear to be something used in the fishing industry. The auto trans uses a neutral safety switch to prevent car from being started in drive or reverse. As to a vacuum controlled lock out unit Inam afraid my knowledge there is no good. A good source for info concerning Mercedes auto transmissions is Sun Valley Mercedes Transmissions in Van Nuys Ca. They have a great website. The owner is Marc who is always willing to share information. Good Luck with your new toy. ,