Here is a link to a similar item I found while browsing the internet. This example appears to be an 11 grid cancel struck twice, the example of rod222's appears to be a 12 grid cancel rotated and struck twice.
If one can exist then the other can as well, need to find a 10 grid cancel struck twice now.
https://www.philasearch.com/en/i_93...85&row_nr=22
Regards,
erthur