Unlike H. Jacobs, he was not a follower of Nicolo Amati, but had a style of his own. It is a pity that, like in the case of C. Kleynman, his work is nowadays often mistaken for that of Jacobs. His conceptoin is bolder than that of Jacobs.
Corners are a little and the purfling is consequently somewhat wider.
His varnish is definitely not inferior to that of Jacobs. The sound-holes are placed close to the purfling. This is qiute a deviation fron Jacobs' execution of this section of the top. Van der Sijde ranks amongst the finest and most individual Dutch makers the 17th century.