Jeff Stephens wrote three very informative articles on Sauer for DGJ. They were mostly about the earlier models and grades. In the Spring 2004 edition:

"The Sauer Grade 60s outnumber the Grade 45s by a wide margin. The reason for this is not known but perhaps a potential buyer for a Grade 45 in the first few years of the last century would have decided to spend the additional $200 in order to buy the most highly embellished Grade 60 to really distinguish the particular Sauer gun from all others produced. Any potential buyer of a Grade 45 would have to ante up some $400 to pay for one of the finest examples ever produced and a staggering sum, for the times, of $600 for the Grade 60. In today's dollars, that $400 an individual paid for a Grade 45 in 1907 is roughly equivalent to $8,000 and the Grade 60 priced at $600 in 1907, is roughly equivalent to $12,000. . .Four to six hundred dollars was not small change by any means in 1907 and this explains why so few of these higher-graded boxlocks were produced."