congrats on your speakers. the back panel looks to be in mint condition for 60 year old speakers
H-H-12 stands for Model H - the second H could stand for the veneer of Hard Rock Maple - and the 12 stands for a 12" woofer
my early Model H's ( 1963 ) came with cane grills
would love to see pictures of the front and sides
K-77 tweeter - K-55V midrange - K-22 woofer - Type 4 crossover listed on the large sheet