This is still a new, still in the box Retra Prime model underwater flash. I purchased four of these strobes last year looking to keep one in reserve in the event one of my three primary work strobes should fail. I really like these strobes and have gone as far as write a review on them (https://underwaterjournal.com/2020/11/16/retra-prime-underwater-strobe/), but I have discovered that the three of these strobes is really all that I need.
This Retra Prime is essentially a new strobe, as it has never been removed for the box in came in. On the outside, the only thing different between the Prime and even newer Prime X is the labeling around the mode switch changing from U1 and U2 to HSS and U as it is now on the Prime X. On the Prime, both the U1 and U2 setting can be set to HSS setting.
Internally, the differences between the Prime and Prime X models are a little bit more questionable in that the newer Prime X model features up to 25% faster recycle times and up to 20% more flashes per battery charge. Beyond that, it’s the same underwater flash.
My selling price is $875 which includes free shipping in the US.