The "C" indicates small format IC core, which is the only core style Falcon products. The C987 will be provided less core unless -6, or -7 suffix is specified (6 or 7 pin core)
Example:...
The following document contains information on Falcon (Non I/C) Hotel Cylinders, including part numbers, key requirements and operation.
Falcon Hotel Cylinders.
DESCRIPTION
PART NUMBER
Conventional Core
23-030
Conventional Core less logo
23-031
Primus Core
20-740
Primus XP Core
20-740-XP
Primus Core less logo
20-741
...
The ND85/AL85/A85 hotel lock is only available in a conventional Key-in-Lever cylinder. Interchangeable core and Primus are not available with this function.
A Primus Hotel cylinder (as well as an IC hotel cylinder) is not possible because there isn't enough room inside the cylinder for all of the required components.