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Three Mullard ECC83/12ax7's labeled quot;Fisherquot; and one ECC81/12at7 labeled quot;Daystromquot; I have no way of testing them, but they all work and were all tested to be good when I bought them within the last year.
The Daystrom was matched for a phase inverter.
#1 amp; #3 have matching date codes.
All tubes have a quot;Bquot; in the code which I believe means they are made in the Blackburn plant.
I think #1 amp; #3 are early 60's dates and # # 2 is earlier 60's date.
From left to right in pics.
#1: ECC83/12ax7- The Fisher; Fisher Radio Corporation New York
I63 B4J1
1022-502
Made in Great Britain
#2 same as #1 except 1022-425
I61 B3E2
#3 same as #1 except I63 B4J
#4
Daystrom ECC81/12AT7
A Product of Daystrom Industries
B2L1
Links to pics:

from : localhost/tinypic.com/9g8rvn.jpg

from : localhost/tinypic.com/9g8ryd.jpg
from : localhost/tinypic.com/9g8s45.jpg

from : localhost/tinypic.com/9g8s9x.jpg
from : localhost/tinypic.com/9g8scx.jpg

from : localhost/tinypic.com/9g8sht.jpg

$100 shipped and insured in the CONUS