Hi Richard,
For ten years I skinned many aircraft for the flight simulator 'Wings Over Flanders Fields' by 'OBD'.
One of those aircraft was the SPAD XIII.
The SPAD XIII was built by SPAD, but also built by other companies under license.
These included Bleriot, Bernard, Kellner Levasseur and SAFCA.
Although SPAD issued their particular colour scheme, the other companies put their own spin on it, so each companies SPADs were somewhat different, including the style and fonts used for the serial numbers etc. Also the position and size of roundels could be different.
Looking at the photographs suggest this SPAD was probably built by Bleriot, as the colour scheme appears to match.
PM or email me as I have information and research material I can send you (too much to post here),
Mike