When purchasing a new lifejacket off ebay always ask the following questions of the seller. I presume you have already worked out whether you need a 150N or 275N, options such has hood or light
1. Expirety date of gas cylinder
2. expirety date of fiing mechanism i.e activation cartridge or hammer
3 If new do you have receipt for registration and has it been registered. -otherwisse you won't get the 3-5 year guarantee whatever the seller saysor it shows on the jacket bag/tag
4 If you can not work out from the picture whether it has a harness or not. You can,t fasten a lifeline to a std life jacket only a harness type
B warned most privete sellers say new when they mean unsed and the cylider/firing mechanism are expired and could cost you £35+ for some models and make the jacket more expensive than new ones. This could also apply the a business trying to clear old stock. SO BE WARNED or it will cost you.
Most of all remeber its you life so look after it CHECK YOUR EXPIRITY DATES. a LIFEJACKET IS YOUR LAST CHANCE BEFORE MEETING YOUR MAKER.