Flash gear ( and other ancillary gear ) can be just as addictive as Leicas themselves. 😱
When I was born (late 1960's), my Dad bought himself a second-hand Nikon S. Somewhere along the way, he also acquired an Acura "Bouncemaster" flash gun, of 1960's vintage. It had one of those fan-flash reflectors, which fascinated little me to no end. 😉
Interestingly, that flash only had a coax PC connection, and Dads' Nikon had the early Nikon bi-post connector, so the flash was no useless with Dad's camera. It still provided hours of entertainment for me. 😛
About 10 years ago, I happened to win a big box-lot of assorted Leica flash and other stuff from KEH, who I guess was cleaning house of some oddball "junque" that just wouldn't move. It came cheap.
Contained maybe half a dozen CHICOs and CEYOOs, plus sync cords, etc.
This is where my 1930's "Blitzlichthalter" came from ( in its red Leitz box! ).
Lots of goodies in there... 😉
My "grail" items of flash equipment, besides a complete Vacu synchronizer, are any powder flash-guns from the pre-bulb era.
I also got hooked on early electronic flashes... one favorite are the early Braun "Hobbyflash" outfits, with their black battery-pack on a shoulder strap, and "gun" type flashholder that looks very much like a 1950's bulb-flash. I have three or four of these, all work on line-current, but I can't get the vibrator circuit going to charge off dry-cells.
Also have a couple Heiland / Honeywell "potato masher" Strobanar units from the early 1960's...
I'm a veritable magpie for oddball camera gear... 😀