What is a casket opening style that allows for viewing from either side with a completely removable lid at the head end?

The style of casket you're referring to is known as a priest casket, which features a slip panel design. This type of casket allows for viewing from either side due to its fully removable lid at the head end. This is particularly advantageous in funeral services where people may wish to view the deceased from different angles. The design also enhances accessibility, allowing for respectful and comfortable viewing by multiple attendees at once.

The functionality of a priest casket meets the specific needs of ceremonial practices where viewing is a significant aspect, making it a preferred choice in many cases. The versatility of the slip panel design exemplifies thoughtful craftsmanship prioritizing both the emotional needs of mourners and the practicalities of the service.