mount: /mnt: can't read superblock on /dev/sdb1

Hi,

by mistake I deleted the first sectors of the disk, with testdisk i have recovered the partition table but mounting the data partition, I have the following error:

mount: /mnt: can't read superblock on /dev/sdb1

with:

btrfs rescue super-recover -v /dev/sdb1

All Devices:
Device: id = 1, name = /dev/sdb1

Before Recovering:
[All good supers]:
device name = /dev/sdb1
superblock bytenr = 65536

device name = /dev/sdb1
superblock bytenr = 67108864

[All bad supers]:

All supers are valid, no need to recover.

any suggestion?thanks a lot