40? Wow. Pot grown ? How big? It’s a beauty x

If it were me and I were living within reasonable driving distance of them I'd clip a representative piece with foliage and flowers, take it to Nuccio's.

http://nucciosnurseries.com

Otherwise it might be possible it is one that is on the general market there at this time, present therefore at independent garden centers. Many of the camellias at west coast retail outlets come from Monrovia*.

http://www.monrovia.com/plant-catalog/search/?view_all=1&query=camellia+japonica&sort_by=botanical_name&zip_code=98026

Also there is a significant labeled collection at The Huntington Botanical Garden in San Marino, there are numbers of camellias at Descanso Gardens as well.

*For instance the Camellia japonica 'Daikagura' - it is often variegated, there is no need for them to include "Variegated" in the name - that Monrovia lists, without a photo may fit the bill. To reach the most reliable conclusion compare your plant with written descriptions, as well as live specimens viewed in person before deciding a particular variety is definitely what you have

http://www.bing.com/images/search?q=camellia+japonica+daikagura&qpvt=camellia+japonica+daikagura&FORM=IGRE

Thanks Jeff! The bloom looks right to me!

It is trained as an espalier

Preferred name is 'Elegans', without the "Chandler's" or "Chandleri".