There were multiple x-over permutations of the HB3 during its lifetime.
Even the original HB1 eventually reached a Mk3 status. Always the Vifa M21 bass/mid driver but the tweeter changed from the D25 to a less good imho (smaller magnet) 26mm Vifa unit in the end.
The crossover was hardwired and always used film caps so isn't prone to ageing in the way it might have been with electrolytics.
The newer HB1's (with Kevlar drivers) are just a different design altogether and were made as a speaker that could be sold for £180 in modern times. Making the HB1 as was, with the drivers & cabinet it had, would result in an £800-£1000 pair of speakers now. Also, such wide speakers have simply fallen out of fashion as everyone (wrongly) wants tall & slim.