Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_49 (acquired INTEGER, design VARCHAR, name VARCHAR)
### Question:
What is the average year for Wallenstein with 1a1 design?
### Answer:
SELECT AVG(acquired) FROM table_name_49 WHERE design = "1a1" AND name = "wallenstein"