Unfortunately can't see the label any more but I do seem to remember that it said 2100+ before I bunged the heatsink on. However am I right in thinking that the CPU clock speed is 100 MHz up to about XP1700+ or 1800+ and 133 MHz above that? I thought it strange that it wouldn't even power up when I'd got it set for 133MHz and it wasn't until I rejumpered it for 100 MHz that it worked at all.
Looks like it might have been a Friday afternoon job then.