@Anpl 

For the Dell Precision 3660 Workstation / Tower, the regulatory identifiers are :
Regulatory Model: D30M
Regulatory Type: D30M001

How to Obtain the Official BIS Certificate Document
You can obtain the exact PDF certificate/Declaration of Conformity for regulatory filing, customs, or tender documentation through the following official channels:

1. Request via Dell Product Compliance Portal (Fastest Direct Method)
Dell maintains a dedicated regulatory compliance helpdesk for enterprise and tender certificates :
Visit the Dell Product Compliance Service Desk .
Open a ticket under "Regulatory Certificate Request / BIS Certificate" .

Provide:
Product Name: Dell Precision 3660 Tower
Regulatory Model / Type: D30M / D30M001
System Service Tag(s)
Your Company / Entity Name

2. Retrieve Directly via the Official BIS CRS Portal
You can verify and generate the official CRS license details from the Government of India portal :
Go to the official BIS CRS Registration Portal (or open the BIS Care App) .
Under the Search by Model / Brand section, select:
Product Category: Automatic Data Processing Machines (Desktop / Workstation)
Brand: DELL
Model Number: D30M
Download the active registration record and validity grant details .

3. Request Through Dell India Order & Commercial Support
If this is required for an enterprise procurement audit or invoice matching :
Open the Dell India Order Support portal under Invoices & Packing Slips > BIS Certificate .
Or email your Dell Account Manager / Customer Care with the Dell Order Number or invoice, referencing Regulatory Model D30M .

You can also contact Dell Support by clicking the blue "Get Help Now" on rightside of page.